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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff4e13b9f2b492fdab58ae46ef5091dd6ee64740bd8ebb2a7b0b922691d605ed' 
  AND token = 'THfneuDwSG9BbGHHc/kNOKhMP1x7e3Tl4jF403oVLto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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