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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e6699f5a52eb78c3da8f7d4dc9a8e1dddab3a84c7b77d22840e744b3ded8064' 
  AND token = 'DeQbkRjFJE7FRehFZ9nR1t98FGKdJy4MIBAF71T9IC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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