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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc9b3334aa871b2fd17a1972f2696de197d2747104c249ced4b93efe4a47fc45' 
  AND token = 'YP4gmdWtWO2w/g2RZvKU9WNbw/bcUM3ofFAQcuahJ6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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