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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e9b7210536a86389a39c9a32b312434b1409177fbe8af75193f77c8f3c9cab4' 
  AND token = 'nGLwDRDS6xULRv70m29d9hnjV3cVYfLcHTntyfpvHrg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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