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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bb08b56e476d9fd6b9de647184e0953e585f203886381a3cb67e2c39dccbf52' 
  AND token = 'ak9fa/g3L063ENbXuCj3g2vNZgvHc/4t4ADSHEMAk28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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