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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb97ac87264f6f09dac9a99b8fb87dc858caf752f631b467022943cb1eea62d5' 
  AND token = '02dCbVTmNzFF8aOpV4LK5oUaxC9bvZaoFYF+ZNH0JVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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