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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd44fbc68a61d8510500da1cac4c82d5b4d63574613bdac59ce518a8f388e475' 
  AND token = 'aPKY2CZ3hFYlMAw4Cu+hQ3dZZag8+2lHFCOVv1hdnfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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