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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c077cdd3619022aebcc0ae40b86a17be53e85c21b72fb64a571a64dae17b98b4' 
  AND token = 'Pyfu5JAhwrJvaJBPUput7ORgKcJrC8cmRqOYdwrq/0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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