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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd4f0be3a89c3bbbd830a7955d37b051100851024ac20d0ade41fb709ec6873a' 
  AND token = 'zXXomXGwFcRIjmclCN3jt4wP3cyYoFE+vXbypKfc/ss=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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