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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a091ebb5bfb0cc7090ea3318ea063ff20d5568f4660b0e142bc8d53ce68e2235' 
  AND token = 'ehhXfvaaR1RHYdZX1wM0UvIArgfR+G8ghIAqL0J7pvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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