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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fd915ea116ddd07182e2b56d59b3f1fc2634c00a145e3ae7bd4830951208885' 
  AND token = 'piubdlWkeqVtAEiEBkUu0OINLOGBZLHf5uo3t2adVw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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