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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd66b6e8d7f2273f353b44ffe57e331d7bffa616264a1c91a35a37ffa7ae369c2' 
  AND token = 'vb1l8Fb7SYTJz7gZJ/1s5gOjTNdvbajAwFqSV2yCPOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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