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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe97cf586b6b3d0c467557f0aeb8352ac8c2a2b62bedd2c8af5ab530c149bab8' 
  AND token = 'eTG7uev17c3aeOrm6jFldJ2i6Z5sBypDlM+XH6o5Qzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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