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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f15ad2fb909a4611d2a8a930741469efa2e5f144d0c7c8ae0e84d19d3c6b2d18' 
  AND token = 'UnpHUDZ0vVRivJt71KNKck7iugdbE5U26/xrbTULomY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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