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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19e615d618353301f87f8fe64d04d189e8d5de36d655a87892d2cd901961ff9e' 
  AND token = 'oIlVIZsiZf5lhMq7R/WFtPbVa9JmdRe/ojot1CF+IUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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