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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b31ad5862ac915023bbbe434b4496ec6c35a0483bfcf62188c07e314d23d6ba4' 
  AND token = 'KBieJ8SFMhHxbQ3+YSMrGXRzQBTR/SAN+fuNKDf+r6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}