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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1203f98137f7cc8760abddd4314d1db970953d935b107c11e19231c9fbfa3be7' 
  AND token = 'n7OZjpIVFkRbUFGPzS57iXie6BAk8YPTKnj85Qzs0cI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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