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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dbf0eba351fe135efa8775d2ef6ccf5e25c8ef4498c43a97ee20b0c217dde3c' 
  AND token = '5txVmdnQe715/9o5yYhS70rrEgmSDzk8yLPZwIJAO+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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