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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d26827f2ac05963d969000e9e1fe965e1c8411d7f3deea7fe6ac19154b21071' 
  AND token = 'PRcdYVyo6VsofGIppBCZMztYKSAse275Q7j+lQwvR8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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