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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3933f00f3ca34a471234a5bdf04ab570710c857d438d713125d89a5644ca88c' 
  AND token = '3J6qUOglsNoHpkco0sn/2aSber+75I2amO2qMwgAZh0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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