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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79b158cbe313128a762e4623d504d8c8d73cad3acdd83abe3df78f6222183e01' 
  AND token = 'naMgynXfk4MF5ZW8iTY82spx6D8xnIkyNZCyIX2hXnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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