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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a02d787ac57997bcc8ee2ed893f73aef3d522250bbf3711e3f98efe877a85467' 
  AND token = 'jVgTBNqIdIvXbLLyBt8zmAjHaVSr7yppo0FVGuzPewg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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