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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fa4b63c2acbe6357b055bc2cdccc50ca623ec01c313e49ec145d02e5f5fbc60' 
  AND token = 'ZJQKaFMVt8axuAJuL3kunOB1Vfo96gH8QjfuYRyI0RY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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