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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f23243472b890b1bd198c888deac5eb1c3c3d9aba3fe5b4a0910475a70ca7b91' 
  AND token = '7PsCdxv/e681Bi9FZnGpajZ9mfGhE5uOAuc0LkO7vts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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