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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da10aabdcf9b48cb97d49016826daec8e513bffeac51cccdb2f2f0bdaee7471c' 
  AND token = 'r1PcuLxIPRN1oOauzlng+yj56W1+4Qj/1fZ0Y/qq0Ik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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