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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ff5ca0519de91e8f15891b9852f8e56ffbc187ad60030ad29f6c4212dc78bd8' 
  AND token = 'q+N5nH0E4fBrWZzvCmpngS1qoXyFEiUIZ669zSxTqfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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