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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41ac76b8984639f19fb30f6d082ec3fc8f53af467c8a4050fd3225d821ea2a1e' 
  AND token = '04sJCrAT4N6y+Pc5VLBILTxy9+14Tpwaq3fbu4sEAMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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