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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21daaa5b1a0d61b97a60362d438dbeb94b538c639618798c3bbb0cfd8f179c64' 
  AND token = 'UphGffQ+W6zhna/p4IAJPxbinnzRXpG17lm796wr/g0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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