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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29957ace6949fb90731f2210e34dad7b1d3c4d23a08a791122f1aed2a4118612' 
  AND token = 'kMdEmiS8J3+DuaDHKLQhu19SI5bDEQvFeYFPZ+kKN/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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