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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3190875b4faa7577ea7e32a15c516ab9945e7102bcfba277bcefc4704d193ee' 
  AND token = 'NR4BTm3hljDZZGH5/4+IM7f+SFw345H+8EDo35oJB5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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