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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a14b7658978376f7f4e4d75e900edfeaae45d4791562bdfd8c45676ce743dbde' 
  AND token = 'tyz9oAct+nOLfv6NIS6G1ztKpVEuFCnrGHX4hSXInzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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