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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6953e2f795eac4535de62b1a8557947130814ea22185209d0d62157c6f180e7a' 
  AND token = '1j8iB0zyXDXeHwWCytDIINz1OVnnUWiVNw3/c+m1AM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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