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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e55f8267ea1ecde964cc08fae90e4d02bc830963c34984265e07348ccdd6b1d1' 
  AND token = 'rGCFhxrpQk2KjrWj50izOYURlXXgRrLFDQ23WwxYYBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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