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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '494be5716f1bd4c8d8b7243aa4c6c2b0bcaa7a2fc977898ee9aa58a4fd17dd9f' 
  AND token = 'lyAr9NvHf7m0FbVdWTsNQ61pJD/I+LETM8W8gw/YHBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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