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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0256b14ee1f9c21aa181da9883aa27924bddff63f6ffa4d2b77ac25915ef0f30' 
  AND token = 'ur2abP0mTlNr41Q33LROCc4bCoFq5ilBcXFGTgJfVv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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