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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f96afb9637d8b0a2a935b16aede472d6f6edae5231e7d2a86a436271b0ec28a' 
  AND token = 'Il7j86I/OgdRvPRi2ej2RAaHsVsTv38v5htADsoi+Ic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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