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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72bddb3b3a18c5eb5976b50a9493a9610e0e309b903e2cf66fa32bd031e4f1f1' 
  AND token = 't27IJfq2L7uaB+MY/6+IxD9p3DsgV5pklZHXB5lNPQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00087

JSON explain

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