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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a976f584a6e66b1f49f8a003ccdef1d6051d2e0c72b15154c4953fbf9b43f2b1' 
  AND token = 'AbZC4FMHQCVR8mAyLol0LXyFvz1KWrFbwo7v5+QD0Ao=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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