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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0972ccf234f066251a1d1c1ac7e8186d591be9144f272b79a76600008c228d1' 
  AND token = 'I9J7mO1xe9p4xfGkOvGMecoHDGW6HzotxMQP7v7KTgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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