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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab97a3a6a100616a1e4877aa6194e39f7c46c19f1f07956f2db0aefa0c456307' 
  AND token = '+6CvYbvSiy5/ZL81MMmgJ0Gs9Hz97odKm9igCevUAt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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