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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26e2bbe6ebf034bed14cbaf2cf91e4276b83af2615de2e11072d88bf88ddcfcd' 
  AND token = '2CCkb1ShezMeTl+/Q5MFx47TOZMP2MnM8vxlHeRErJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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