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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2c2961401d43f7f31fd0643855ff699522a3e9b25a613dd76748a9d9ac1fefb' 
  AND token = '2R0MSmrKdy5BnitfAVRGHRJ+e10NpVLDhhYKeBio1a0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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