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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efd72023bcd73239b4436f99c0d6bb2cc0832c9cf50ea35ebe6f284e78b3d27a' 
  AND token = '0rl79pWyOeUCofed3pi0ZwInGwpJWQGp1iU0LHjknjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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