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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c5d562977cc89b6ede1a5771678d797001bdeac921c8caee392d8c2e30bbdb3' 
  AND token = 'EEfEdIJj4xBQZ0KfQ/sd9HeszCKCkj7Lyy85uCZmxmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00083

JSON explain

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