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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '051c6920ec190e52e98f4bc4edd34a00a99ba9fcf752f2e1a514e700949804d5' 
  AND token = 'nJ9F3Ijve2O4SQpayV/s14z/yKq73nIOXbmH+6ks6MQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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