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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8d1b664618dbf44811d1b8f91329240d15a64562508393916655761ebaaac34' 
  AND token = 'hnH6j/4dNfLFwyOycVbKPxYGQUtTT1W6r5s97zXNvG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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