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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0587b6867533ac774692e1a536aea9aeaa3bff36e199e540896e5ee6bebd74a4' 
  AND token = 'ByGX73GrGv2xE+GtGDVtbiZlkrGWZdhMd/YYs3xDtW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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