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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c08def61b00a583ca9ff231e1ea885bc3bec09314d7a44f81c701176c1873be5' 
  AND token = 'yGUaPRrznC9ly5nQdfZULv9XzrwbgvktR9WuNCmcoms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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