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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5c9dc18401673d8b74bac65b33f96d6bfccabd447e98d3af7566371d5d19719' 
  AND token = 'yvLlo0fS7fKk7w9ioVHaPPhO/QpU5vz0h4KBELLs4cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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