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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dad51a940e495f6aeee103cf6073773c8ede4d8302ea4c1bac12fec81f64481' 
  AND token = 'Em5EZ8bp5mEzRMFHS8ZWf7He00MdMBsqaz3Ls/lBYjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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