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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fd5df6f821a513ba64a567d0bfa466174039dbf83a8782af9869cdbd2637d9f' 
  AND token = 'Tp1kzxyM1p09KEo9itZ0lfZ8XvPgHYKKYUiiTw3FxS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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