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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5f00d984f61e9604df48e44b9719d80fa62535bbf1c3749038316f8ef5f5cfd' 
  AND token = 'EoqoXTxq8SX952eUBwyPIhz+WyXvARQVtHyhjQobo8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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