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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aee62410fc5b6b18a47b47d996f985317d65ccd150c5e556e04507a0275a555a' 
  AND token = 'oM+4e7LpvntFxZitFJPYTIzw+lGA5tVqlm3Hz272irI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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