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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0939066fed611e4a96288c9d730fd88fa27c09de4fb759994d64dd9eaebc5f7f' 
  AND token = 'jLzdmkhIiQmEFkdHye6ZMJVv0bk48Y7R+xyTPG3fdUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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