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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85be9e80ff4810502ec3d0ba2377242cef1d1910bd68a73f8a6df4b52b1d5b3f' 
  AND token = 'dMhA0YVUNZfEUt9FP7wF+3QyZCTi11OPMbVKrrEU6bA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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