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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abb1b9314b000e5c1bcee1e48c117f25b3e2d317b8e5256d1f4c794038268834' 
  AND token = 'qS3cFVixBLF/+gZUy9SmNT7UNBKBtQtsGOH4u2bknl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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