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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe5a947ee4b97fb65f44c039b52faa7c258460dfd4da096ed45ac73712e4aba3' 
  AND token = 's23Pj8mQRE6WaiRWIVX/CkPOobpwLVfoaUChAuoc+EQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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