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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'addf993c0ed68360c00fc436a99a5ef023846d7c7f5072b49847bb069cac08b3' 
  AND token = 'LiWi9fo5/vrgZx+Q0DiB4AhXqPmdqodG9riaPuOscCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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