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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '745257432c4df604faa353a45864bcaeccc74a502fdaaaa9e9fc836b6874c59c' 
  AND token = '3rT6B9pBhc6X9WnAs/8VUHqo/vyjq/r8d9USoqB4vAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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