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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f357f9a2208f33cb8b68443fcd462c0c81e1ed3a31c12b6dd4a09fb629d6f10' 
  AND token = 'xOL90OpbLZTBENlcglkA5tbY0QEr+AfgW1b7KypyJXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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