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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b91aca26e409c004bad17ea38ed98f0b4989cd014b007a11d5722ab5b18ac35' 
  AND token = 'kxfGQQOMjtNkOCg3Di1o1hSypvs5sOdPD6dxu9K2LjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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