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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be2460789052a0f237953e6065f4d56edf3b1f9978e1fab701c8dd1cd4b3af43' 
  AND token = 'X5J+ZJs7tWIZ86IjzzLW9JSljbNdwxdXfONsTrcrSB4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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