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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee7a6d0465b67643cc7d7acedcdee47603b017fd2f7d4574bf685c9c42409732' 
  AND token = 'EiohQ5XWdR2AlBdGGGmRe9x11opEPEjTQ/qed8IoKI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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