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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25ccd5ccb6b8e6f04d71b1c44ee3ff3346fe8ee87f337f1af9837d451843ec1b' 
  AND token = 'Gs6X+b0qW9t+VvNPMmPwyc/fyBxX4cqgwjjxXdesntM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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