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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd97b1dd9ba9998a9a253569623aff9100db13f39be3bb2565fbefa5e6cd9d3be' 
  AND token = 'RsKUFOP6L3m3mVPLK292ijsDCC4l31F3gt4ZyHxUCs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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