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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '552307d6ebd48d50edf5df2185e5216952f15960a929fa6b31c65349ace9cefd' 
  AND token = 'oT9+++T6QphXraAGLeh7th9y+SHgpHtkyeqk+vjN1U8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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